Constant factor mechanism



Nov. 24, 1953 H. J. CHALL 2, 77

CONSTANT FACTOR MECHANISM Filed March 20. 1950 s Sheets-Sheet 2 FIE E t glr t w I VENTOR. HnRoLo Cum.

Nov. 24, 1953 H. J. CHALL CONSTANT FACTOR MECHANISM 8 Sheets-Sheet 5 Filed March 20, 1950 HAROLD $751136.

Nov. 24, 1953 H. J. CHALL CONSTANT FACTOR MECHANISM 8 Sheets-Sheet 4 Filed March 20, 1950 INVENTOR. HAROLD J. Cum.

v PN- Nov. 24, 1953 H. J. CHALL ,660, 77

CONSTANT FACTOR MECHANISM Filed March 20, 1950 8 Sheets-Sheet 5 INVENTOR.

HAROLD J. Cmau.

Nov. 24, 1953 H. J. CHALL 2,660,377

CONSTANT FACTOR MEHANISM Filed March 20, 1950 8 Sheets-Sheet s FIE 1E 39 79 FIG E F]: E 1-' :I

21 M \as as I31 I40 20 INVENTOR. 39 HAROLD J. Cum.

Nov. 24, 1953 H. J. CHALL CONSTANT FACTOR MECHANISM 8 Sheets-Sheet 7 Filed March 20, 1950 m mHlu huH-"H GM INVENTOR. HAROLD J. CHALL Nov. 24, 1953 H, J, CHALL 2,660,377

CONSTANT FACTOR MECHANISM Filed March 20, 1950 8 Sheets-Sheet 8 JNVENTOR. HAROLD J. CHALL Patented Nov. 24, 1953 CONSTANT FACTOR MECHANISM Harold J. Chall, San Leandro, Calif., assignor to Friden Calculating Machine 00., Inc., a corporation of California Application March 20, 1950, Serial No. 150,623 (or. 235-444) 14 Claims. 1

This invention relates to improvements in calculating machines, and is more particularly concerned with an improved means for selectively re-entering a constant dividend or other predetermined fixed value into the accumulator, or product register, as part of the accumulator clearing operation Whenever such a value is reused repeatedly.

In performing on a calculating machine a series of individual calculations involving a common factor such as a constant dividend, it is frequently desirable to repeatedly re-enter the constant value, or factor, into the accumulator, or product register, dials as part of the accumulator clearing operation so that such a reoccuring value will be immediately available at the beginning -of the next calculation in the related series.

Such a constant factor, or value, frequently occurs, the most frequent example being a series of consecutive division operations in which a pre- It is another object of the invention to provide an improved mechanism for entering a predetermined common factor into the accumulator of a calculating machine as part of the accumulator clearing operation and to positively lock this predetermined factor into the accumulator dials until such time as the erasure thereof is desired by the operator.

It is still another object of the present inven tion to produce a mechanism of the above character wherein the accumulator tens-transfer is disabled during clearing operations and is positively locked in its active position during digitation.

It is also an object of the present invention to provide a mechanism which is operable to enable the entry into or removal from the accumulator of a constant dividend factor only after the associated clearing mechanism has completed its normal cycle of operation.

It is still another object of the invention to 5 produce a mechanism for automatically entering a predetermined constant value into the accumulator of a calculating machine as an incident to the erasure of figures previously standing in the accumulator, which mechanism is positive in its Cir 2 action, even when the erasure is performed by power means and the machine is operated rapidly at a relatively high rate of speed.

Further objects are to provide a construction of maximum simplicity, economy, and ease of assembly and disassembly, also such further objects, advantages, and capabilities as will fully appear and as are inherently possessed by the device and the invention described herein.

The invention further resides in the combination, construction, and arrangement of parts illustrated in the accompanying drawings, and while there is shown therein a preferred embodiment thereof, it is to be understood that the same is illustrative of the invention and that the invention is capable of modification and change and comprehends other details of construction without departing from. the spirit thereof, or the scope of the appended claims.

Referring to the drawings:

Fig. 1 is a cross sectional view of the rear portion of a Friden calculating machine having the usual selection and actuating mechanisms and a shiftable numeral wheel carriage provided with means for selectively re-entering a constant dividend, or other fixed value, into the accumulator as part of the clearing operation.

Fig. 2 is an enlarged plan view of the left end of the shiftable numeral wheel carriage illustrated in Fig. l.

Fig. 3 is a front elevation of the left end of the shiftable carriage shown in Fig. 2.

Fig. 4 is similar to Fig. 3, but has the front half of the carriage removed to show the interior mechanism.

Fig. 5 is a front elevational view of the right end of the shiftable carriage.

Fig. 6 is a typical cross sectional view of the shiftable numeral wheel carriage.

Fig. '7 is an enlarged elevation of a numeral dial shaft assembly forming a part of the instant invention.

Fig. 8 is similar to Fig. '7, but shows the clutch teeth in the disengaged position.

Fig. 9 is an enlarged sectional view taken along the lines 99 in Fig. '7.

Fig. 10 is an enlarged sectional view taken along the lines I lli0 in Fig. 7

Fig. 11 is a bottom view of the upper portion of the dial shaft assembly taken along the lines (-4 l in Fig. 7 and rotated 90 degrees in a counter-clockwise direction.

12 is a side elevation of the right end of the shiftable carriage with certain parts removed to show the mechanism for disabling the carriage clear racks during a resetting operation.

Fig. 13 is a side view of the right-hand side of the control plate showing the counter-reversing mechanism and the means for operating the mechanism shown in Fig. 12.

Fig. 14 is a bottom View showing to an enlarged scale the tens-transfer levers illustrated in Fig. 3.

Fig. 15 is a side elevation of the upper clutch and mutilated clear gear assembly.

General description This invention is illustrated as embodied in the type of calculating machine disclosed in Carl M. Friden Patents No. 2,229,889, dated January 28. 1941, and No. 2,294,111, dated August 25, 1942. The general arrangement and operation of such a standard Friden calculating machine is well known, which machine is provided with a shiftable register carriage mounted for endwise sliding movement on bracket 2|, and on frame bracket 22 by means of rollers 23. The register carriage 20 serves to mount the numeral wheels 24 of a revolutions counter mechanism having an actuator 25 of suitable construction associated therewith. The carriage mounts a numeral wheel 26 in each order of the accumulator or product register, each such wheel being suitably journalled between the front and rear carriage frames 21, 28 and arranged for actuation through a pinion drive gear 39 which is engageable with suitable plus-minus gearing 29 having a sliding engagement with a square shaft 3!), but mounted for rotation therewith. A pair of selection gears 36, also slidably and nonrotatably supported on the square shaft 30, are operable to receive from the coacting selection slides 51 differential increments of movement which bear a predetermined relationship to the numerical value of an amount key 32 which has been depressed in that order. Hence, the stepped teeth on the associated actuating cylinders 3| unidirectionally rotate the coacting square shafts to an extent controlled by the usual bank of numeral keys associated with each order of the keyboard. During digitation, the sign character of registration for the accumulator dials 26 is controlled by shifting of the plus-minus gearing 29 for selective driving engagement with pinion gear 39 under control of a strap or gate 33 which is mounted by suitable upright arms 34 on a transverse rockable shaft 35 adapted to be controlled in any convenient manner in performing calculating operations, as by manually depressing the plus key of 31 (Fig. 13) or the minus key 38.

Secured to the lower end of the dial shafts for each of the accumulator wheels or dials 26 is a transfer cam 4| which is adapted to cooperate with a transfer lever 42 (Fig. 14) pivotally mounted on a stud 43 and provided at its other end with a downwardly depending lug 44 which lies between a pair of flanges provided on the hub 45 of a tens-transfer gear 46 located in the next higher order of the machine. As is fully shown and described in Friden Patent No. 2,229,889, supra, a single tooth on transfer cam 4| rocks the associated transfer lever 42 by en gagement with the cam projection 56 (Fig. 14)

whenever accumulator numeral wheel 26 passes I from 0-9 or from 9-0, thereby causing the lug M to move the transfer gear 46 in the next higher order into the path of a single-tooth transfer actuator 41 (Fig. 1) carried by the power driven shaft 48 which carries the stepped drums 3|.

After each such tens-transfer operation has been completed, the transfer gear 46 is returned to its normal ineffective position, out of the path of the coasting actuator 4'1, by engagement of the restore cam 42 with the restore actuator 50.

Constant dividend mechanism Referring now to Figs. '7 and 8, there is provided for each order of the shiitable carriage a vertically disposed shaft portion 40 of relatively small diameter which is connected at its upper end to a portion 60 of enlarged diameter which has been milledv flat on one side 6| (Fig. '7) so as to form a driving engagement with the coacting accumulator dial 2B which has been press-fitted thereon. This shaft portion 40 preferably is formed integrally with a central shaft portion 63 of square cross section (see also 9), which square shaft portion is connected with a lower cylindrical shaft portion adapted to be suitably journallcd in a cylindrical bushing 64 which is held between the inwardly extending lower flanges cf the carriage frame members 21 and 28. The lower end of each such dial shaft has affixed thereto a beveled gear 39 which is adapted to be driven by the associated plus-minus gearing 29 (Fig. 1). Preferably, but not necessarily, each of the outboard. order register dials 25 has secured to the lower surface thereof a notched disk 65 (Fig. 11) which coacts with a forwardly extending sensing slide 66 (Fig. 2) forming a part of the mechanism disclosed in copending application 5. N. 66,688, filed December 22, 1948, which disks 65 and slides 66 have no direct relationship with the subject matter of the present invention.

Rigidly secured to each square shaft section 63 in a predetermined position above pinion gear 33 is tea-tooth star wheel 6! (Figs. 1, '7, and 8) adapted to coact with an associated springpressed detent so as to exert a centralizing action on the dial shaft assembly after digitation and resetting of the accumulator dials 26. A lower compression spring 68 bears against the lower surface of star wheel 61 and urges bushing 64 downwardly against the upper surface of the single-tooth cam 41. An oppositely disposed upper compressicn spring 69 bears down- Wardly against the upper surface of each star wheel 5! and exerts upward resilient pressure on an annular flange 10 provided at the base of a shiftable collar 7| which is slidably supported on a square shaft 63 but mounted for rotation therewith, as shown in Fig. 9. Shifta-ble collar H is provided with a pair of upwardly extending and diametrically opposed clutch teeth 12 which are adapted to be urged by spring 69 into clutching engagement with the coacting clutch teeth I3 provided on the lower cylindrical surface of an upper clutch member '15. This clutch member 15 is adapted to be rotated about shaft 40 as an axis by a mutilated gear it carried by a sleeve 77, which sleeve has secured to its up per end a single-tooth gear or overtravel blocking tooth #8. The downwardly depending clutch teeth 13 on upper clutch member [5 are equiangularly spaced-apart to correspond with the numorals on the associated dial 26. Each such member '15 carries a disk 19 having a clear sensing notch 82 (see Fig. 10) formed therein, which notch preferably is provided with chamfered outer edges ill. Each upper clutch member 75, notched disk 19, sleeve 17, mutilated gear 15, and. the overtravel blocking teeth 18 are rigidly united together in the form of an integral clutch and mutilated gear assembly 82, which unitary 5 assembly is best shown in Fig. 15. When the clutch teeth I2, I3 are in their normally engaged position, the coacting mutilated gear assembly 82 is clutched to and rotates along with the associated dial shaft assembly 92 (see also Fig. 7) when the latter is actuated.

As is best shown in Figs. 7 and 10, each mutilated gear I8 preferably is a ten-tooth gear having two teeth removed so as to form a relatively flat mutilated portion 86 which has a predetermined quadrature relationship with respect to notch 80 and is disposed on the right side thereof as viewed in Fig. 10. Overtravel blocking tooth I8 (Fig. 11) also bears a substantially dia metrically opposed position with respect to notch as in such a manner that reciprocating movement imparted to resetting racks 83, 84 (Fig. 1) by suitable power means or by manually moving the accumulator clear knob 88 (Fig. 12), will always return the clutch and mutilated gear assembly 82 to the same predetermined angular, or clear, position irrespective of whether the supporting dial shaft assembly 92 returns the associated numeral dial 255 to O or to any other predetermined value which is to be repeatedly reset or retained in a particular order of the accumulator. As shown in Fig. 4, the mutilated gears I6 on alternate shafts are offset vertically on sleeves 11, so that alternate ones will be operated by rack 83 and the others by rack 84, thus allowing the accumulator dial assemblies to be more compactly contained within the shiftable carriage 129. The upper and lower bar racks 83, 84 are connected together at their ends (Fig. 12) in a well known manner so as to operate as a unitary structure. The accumulator clearing knob 88 (Fig. 12), which moves with the rack bars 83, 84, is independently movable so as to clear or reset only the accumulator dials 26. with knob 37 by suitable means so as to reciprocate bar rack 9i (Fig. 1) and simultaneously reset both the revolutions counter dials 24 and the accumulator dials 26, when so desired.

Manipulation of stud 90 together with the knob 83 supported thereby (Fig. 12) during an accumulator clearing and resetting operation rocks a bellcrank, not shown, which moves a slide bar I 06, mounted for endwise sliding movement on the top of carriage 2e, from the normally inactive position shown in Fig, 2 to an active position wherein the forwardly extending blocking fingers Ifll on slide Illi. are conditioned for stopping engagement with the coacting overtravel blocking teeth I3 (Fig. 11). The slide I is returned to its normal position by a suitable spring Iii}. Hence, during an accumulator clearing or resetting operation, each clutch and mutilated gear assembly 82 is always returned to the same predetermined adjusted or angular position, with the result that all clear sensing notches 8Q thereon have a predetermined aligned relationship at the end of each such clearing or resetting operation irrespective of whether the supporting dial shafts have been rotated so that the associated dial 26 indicates O or any predetermined and preselected value desired to be re-entered or retained in that order of the accumulator. As slide bar we moves to its active position, toward the right as shown in Fig. 2, it carries with it an end fitting I02, the free end of which bears against the upper end of a lever I03 pivoted on the carriage frame as at I04 (Fig. 3). Lever I03 has a slotted lower end I95 which engages with a pin I66 mounted on the web of a U-shaped channel member IOI. Chan- Knob 88 may also be actuated along nel I0] is longitudinally disposed along a rectangular recess I08 longitudinally disposed along the lower forward portion of the front carriage frame 21, the said channel member being mounted for predetermined endwise sliding movement along recess I98 by a pin-and-slot connection provided by the screws 169 (Fig. 3). The spacedapart and horizontally disposed inwardly extending flanges III! on channel member I01 support the pivot studs 43 for the transfer levers 42 (see also Fig. 14), and each such stud has a torsion spring III coaxially supported thereon, one end II2 of which bears against the web of channel I91 and the other end of which is affixed at the point H3 to the associated stud 43. Thus, the torsion springs III tend to urge the transfer levers 42 to the normally ineffective position shown in Fig. 14. Channel I61 is adapted to be locked during digitation in the tens-transfer enabling position shown in Fig. 3, by mechanism to be hereinafter described, in which position the rearwardly extending ear t of each transfer lever 42 is rigidly held in an engaging position with relation to its coacting single tooth transfer cam 4I (Figs. 1, 8 and 9). Channel IIl'I normally assume the operative position shown in Fig. 3 by reason of compression spring H5, which is coaxially supported on an adjustable guide stud H6 and is compressed by a coacting ear lit provided on the left end of channel IIII. However, operation of the clearing racks 83, 8'4 and blocking slide Hi9, rock lever I03 clockwise, which in turn moves channel III'I to the left. Whenever channel W1 is thus moved by lever I93 to the left (i. e., its inactive position) the ear 56 on each transfer lever 42 (see also Fig. 14) is moved out of the operative range of its corresponding transfer cam 45 so as to completely disable the tens-transfer mechanism for the duration of a clearing or resetting operation. After each such clearing and resetting stroke of the rack bars 83, 84 is completed, the compression spring H5 urges channel IflI back toward the right to the operative position shown in Figs. 3 and 5, in which position an ear 240 on the right end of channel I91 comes to rest against the end 230 of an adjustable stop 2'28 mounted on the right end of carriage Hi. This restoring action of compression spring lI5 also rocks arm I93 and aids the tension spring I I9 in restoring slide I90 to the normally inactive position shown in Fig. 2, wherein an upwardly extending flange !22 on the blocking slide I00 comes to rest against an adjustable resilient stop I23 mounted on the top of the carriage.

Referring now to Fig. 4, there is shown on the left end of shiftable carriage a constant divident, or accumulator re-entry, control lever I25 which extends upwardly through a longitudinal slot in the upper portion of carriage 20, which lever is pivotally supported about a horizontally disposed pin I 44 transversely mounted in the carriage frame. This control lever I125 is provided. with an enlarged base 91 bearing a stud I26 which is slidable within a vertical slot I2'I' rovided in a terminal bracket 528 secured to the left end of an upper control slide I29 longitudinally disposed interiorly within the front carriage frame 2'I. Slide I29 has a longitudinally disposed horizontal slot I30 in each end thereof, which slot forms a sliding engagement with a coacting fixed pin I which holds the front and rear carriage frame members 21, 28 together. The fixed pin I3I also forms a sliding engagement with a coacting vertical slot I32 provided at each end of a lower control slide I33 longitudinally disposed within the carriage 20 below the upper control slide I129. Upper slide I29 is also provided with a plurality of ordinally-spaced and downwardly projecting position sensing and locking lugs I 31 (Fig. 4). A tension spring I34 connected by the pin I35 to the carriage frame and at its other end to a pin I36 mounted on the top of slide I29 tends to move the latter toward the right, as viewed in Fig. 4, so as to urge the lugs I3I out of locking engagement with the slots 80 provided in the coacting clutch and mutilated gear assemblies 82. In the event the clearing, or resetting, operation has not first been fully completed, or for any reason any one or more of the slots 88 in the coaoting assemblies 82 are out of predetermined adjusted and aligned relationship so as to block entry of one or more of the coacting lugs I31, the upper slide I29 will be prevented from being moved to its leftmost position. Such blocking of slide I29 also blocks rocking movement of control lever I25 counterclockwise from the normally inactive position shown in Fig. 4 to its active position, thereby indicating to the operator that the machine has not been properly conditioned for entry into, or removal from, the accumulator dials 26 of the constant dividend or other common factor. However. when slots 80 in the clutch and mutilated gear asset-nblies 82 are in the predetermined aligned relationship to receive the coacting sensing and locking lugs I31, control lever I25 can be rocked to its active position (counter-clocl:wise in Fig. 4), thereby moving the lugs I3! into locking engagement with the coacting slots 82.

Upper slide I29 also has secured to the top surface thereof a saddle member I33, the vertical sides of which coact with the upper of a bellcra-nl; I39 pivoted on the carriage frame as at I 40. The other arm of bellcranl: I39 carries a pin I II which coacts with a saddle I42 secured to the top of lower control slide I33. When lever I25 is rocked to its counter-clockwise position, movement of upper slide I29 and its saddle I38 rocks bellcranl: I39 (counterclockwise in Fig. 4), so that pin MI moves lower control slide I33 downwardly, which vertical movement permitted by the movement of the slots I32 with relation to the coacting pins I3I. Lower slide I33 has a rearwardly extending horizontal flange I43 thereon which overlies the an nular flange III on shiftable collar 'II in the manner shown in 6. Hence, whenever arm I25 is rocked counter-clockwise to its active position so as to move upper control slide I29 toward the left, bell crank I39 is rocked (counterclockwise in Fig, 4) so as to vertically depress the lower slide I33 and move all of the associated shiftable clutch collars II from the normally engaged or closed position shown in Fig. 7 to the open or disengaged position shown in Fig. 8. The clutch elements II, 15 can be thus disengaged only after a clearing and resetting operation has first been performed, which operation preconditions all of the notches 8!) to receive the associated lugs I31 for locking engagement therewith. Hence, the normally closed resilient clutches are opened at substantially the same time as the upper clutch assemblies 82 are locked against rotation by engagement with the lugs I31.

Whenever each such shiftable collar TI is in the uppermost and normally engaged position shown in Fig. "7, the coacting clutch and mutilated gear assembly 82 and its associated dial assembly 92 turn as a unit and are reset to a predetermined angular position during the first movement of the clear racks 33, 84, in which reset position the thus rotated assemblies 22, 92 are held by coaction of the spring-pressed detent 95 (Fig. 1) with the associated ten-tooth detent wheel El. Whenever the control lever I25 is moved to its active position, however, so as to depress the control slide I 33 and move the collars II downwardly and thus disengage the normally closed clutch teeth I2, l3 as shown in Fig. 8, each numeral dial 215 and its associated dial shaft assembly 92 can be rotated to any desired angular position by turning the pinion gear 39 or the twirler knob 85, but without imparting a corresponding angular displacement to the associated clutch and mutilated gear assembly 82.

Revolutions counter control mechanism As is fully shown and described in the aforementioned Friden Patent No. 2,294,111, such a calculating machine is provided with means for selectively setting the countewreversing mechanism, indicated generally at i if? in Fig. 13, to cause either positive or negative registration of t e revolutions counter wheels desired. In conventional Friden machines two such controls used: one a setting lever, not shown, suitable for all operations; and a second a counter-control hey I56 (Fig. 3) immediately adjacent the division operating key and operable there'.vith. Such a counter-control key IE9 is supported for endwise sliding movement on the control plate 53 by the pin-and-slot connections IEI, is urged to its normally raised position by a spring I .1, and is also provided with a roller 153 which against the coac'ting cam surface I43 provided on the lower leg of a lever 554 pivotally mounted on plate as at iiiii, and having an upper arm connected by pin Ito to the forward end of drag link 53'. The link IE1 is connected at its rear end by the pin-and-slot connection IE8 to the upper arm of a bellcranl: I55, pivoted as at I653 on plate 59. Eellcranlr E53 has a rear wardly extending fin er ISI and a downwardly depending arm I52 thereon. The bellcranlr. E59 is urged toward link It] by a tension spring I53 having its other end extending through a hole I 64 suitably positioned in the link.

A shaft IE5 (Fig. -3), whose rocking movements control the associated mechanism for reversing the direction of rotation of the revolutions counter dials 24, is fully shown and described in Friden Patent No. 2,294,111, supra, has secured to its outer end a counter-setting mem ber its having respective upper and lower notches Iii'l, its which are operable to engage with the respective pins I69, Ila carried at the forked end of a reversing arm Ill. The arm III is pivoted at I12 to the end of a plus-minus slide I13, conventionally arranged to be moved rearwardly upon depression or the plus control key 3'! and to be moved forwardly upon depression of the minus control key 38. Arm ill is normally retained by spring I'M in the position shown in Fig. 13 wherein pin I59 engages with notch it? so that rearward movement of plus minus slide I73 imparts a clockwise rocking movement (Fig. 13) to counter setting member I 68 and the associated counter control shaft I 85, while a forward movement of slide I'II rocks member IE6 and shaft I65 counter-clockwise. Whenever control key I53 is depressed, however, link I5? moves forwardly so as to rock bellcrank I59 (counter-clockwise in Fig. 13), thereby causing finger Iii to lift pin :89 out of upper notch I61 and to move lower pin I'l'il into engagement with notch I68, in which position the action of arm Ill on counter-setting member R63 is reversed so that rearward movement of arm III rocks the counter-control shaft I65 counterclockwise While forward movement thereof rocks shaft I65 clockwise.

As shown in Fig. 13, there is slidably supported for predetermined endwise movement on control plate 59 an interlock control slide 2% having a longitudinally disposed rectangular aperture I99 therein adapted to form a pin-and-slot connection with the machinne screw I62 which forms the pivotal support for bellcrank E59, and also has a slotted forward end 20! which forms an endwise sliding engagement with a stud 202 carried by control plate 58. Slide 29!} is provided at its rear end with an adjustable tip 203, the rear end of which coacts with the free lower end 294 of a bail 265 which extends longitudinally along the lower forward edge of the carriage and is supported thereon by short pins 206 which proj ect outwardly from the support brackets 26! (see also Fig. 5). Slide 205 has a vertical slotted arm 208 (Fig. 13) extending upwardly therefrom, which arm slidably engages a pin 269 carried by the upper arm of a lever 21E, pivotally mounted as at 2 on control plate iii], the lower arm 2I2 of which carries the roller 2I3. A spring 2K4 urges lever 2H) in a counter-clockwise direction, as viewed in Fig. 13, so that roller 2 I 3 is yieldably urged into a detent, or depression, 2I provided in the adjacent surface of counter-setting member I66. Thus, lever 2I0 is rocked clockwise whenever the member IE6 is rocked in either direction away from the normally centralized or neutral position shown in Fig. 13, regardless of whether the rocking movement imparted by plusminus slide. H3 to counter-setting member Hit by arm I'H occurs when pin His is in engagement with upper notch 61 or when pin I78 is moved into engagement with lower notch I68. Hence, any rocking movement imparted to member I66 by reciprocation of the plus-minus slide I13 resulting from addition, subtraction, multiplication, or division operations causes a rocking movement of arm 21!? which imparts a rearward movement to interlock control slide 2% through pin 209, with the result that the tip 263 of slide 2E0 rocks bail 2E5 counter-clockwise as viewed in Figs. 12 and 13.

Interlock slide mechanism Referring now to Figs. 5 and 12, there is shown transversely supported across the right end of carriage 20, for predetermined endwise sliding movement therein, an interlock slide 220 yieldably urged rearwardly by a compression spring 22I. Slide 220 is provided with a rectangular aperture 222 and a notch 223, both of which are adapted to register with the coacting ends of the associated clear racks 83, 84, and 9| so as to enable the normal operation thereof, when the slide is in its rearward position. Whenever slide 220 is normally maintained in the rearward position, a rectangular notch 226 (see Fig. 12) provided on the lower forward surface of the slide permits passage of an ear 221 which extends upwardly from the right end of the U-shaped channel III? which carries the transfer levers 42. Hence, the accumulator clearing and resetting racks 83, V84 can be reciprocated by the usual means in performing a carriage clearing operation, and the transfer levers 42 carried by channel it! can be moved out of the path of the associated single-tooth transfer cams or tripping teeth 65 by rocking lever I83 (Fig. 3) and compressing spring MS, as previously described, thereby temporarily disabling the tenstransfer mechanism for the duration of each accumulator clearing or resetting operation. Upon the termination of each such resetting operation, however, the channel It? is returned to its transfer enabling position by spring H5, in which active position channel It! is adapted to be locked during digitation by the action of interlock slide 22!}.

It will be recalled that any longitudinal movement of plus-minus slide I13 away from its neutral or inactive position causes the interlock control slide 290 (Fig. 13) to move rearwardly so that the adjustable tip 203 thereof imparts a rocking movement to bail 205 which is pivotally supported longitudinally along the shiftable carriage 20. Adjacent its right end, bail 205 is provided with an upwardly extending lug 23I (Figs. 5 and 12) which forms a camming engagement with a downwardly depending ear or lug 232 on a right angle extension formed on the forward end of interlock slide 220. Thus,

the rocking movement which is imparted to bail 205 by the rearward movement of control slide 200 compressses spring 22I and moves slide 220 forwardly. Whenever interlock slide 220 is thus positioned in its most forward position, the upwardly extending lug portions 235, 236 thereon form a blocking engagement with the coacting ends of the respective clear racks B3, 84, and SI in such a manner as to positively prevent manual clearing of the accumulator dials 26 and counter dials 24 during digitation, while the downwardly depending lug portion 23'! on the forward end of slide 228 moves into blocking engagement with the upwardly extending ear 221 on channel I01 (Fig. 5) so as to positively lock channel I01 and the transfer levers 42 carried thereby against lateral displacement as long as slide 220 remains in its forward position.

Operation In order to reset all of the accumulator dials 2b to O, or to reset a constant factor into the accumulator, during each manual or power operated clearing operation, the dividend entry and accumulator resetting control lever I25 is re-. tained in its normally inactive position as shown in Fig. 4. In this position all of the sensing and locking lugs I31 carried by the upper slide I29 are free and clear of the respective notches in the coacting clutch and mutilated gear assemblies 82 In this position of control lever I25, the lower slide I33 is also retained in its uppermost position as shown in Fig. 4 so that the lower clutch teeth 12 on shiftable collar 'II are resiliently urged by spring 69 into clutching engagement with a particular set of upper clutch teeth I3 so as to lock each upper clutch assembly 82 to its associated dial shaft assembly 92. In this condition the reciprocation of the accumulator clear racks 83, 84 will either clear and reset all of the accumulator dials 26 to 0 or will insert the constant factor, depending on the previous setting of the machine. It will be recalled that during each such operation of the clearing mechanism by the usual means, slide. it") is moved to the right (as viewed in Fig. 2) so that each finger IBI carried thereby coacts with the associated blocking tooth 18 on the ll corresponding multilated gear assembly 82 so as to positively prevent overtravel of the asso ciated accumulator wheel 26. This lateral movement of slide I to its active position at the beginning of the clearing operation imparts through arm I02 a rocking movement to lever I 03 (clockwise in Fig. 3) which compresses spring H5 and moves the channel ID! to its tens-transfer disabling position during the carriage clearing operation. As previously mentioned, interlock slide 220 is positioned during digitation to block operation of the clearing racks and also displacement of the channel In! from its tens-carry position. The normal position of slide 220, shown in Fig. 12 enables the clearing movement of the racks 83, 84, and Si, and also permits the lateral displacement of channel III! to its tranasfer disabling position wherein the lugs 56 on the associated transfer levers 42 are moved out of operative engagement with the single-tooth transfer cams M on the associated dial shaft assemblies 92. Whenever control lever I is initially positioned in the inactive position shown in Figs. 3 and 4, it will thus be apparent that positive and negative values may be entered into the accumulator dials 26 in the usual manner during digitation by the selection and actuating mechanisms of the machine, which values may readily be erased and all accumulator dials 26 reset to O by cowaction between the clearing racks 83, 84 and the coacting mutilated gears carried by the upper clutch assemblies 82.

Whenever it is desired to enter a new constant factor into the accumulator dials 26, an accumulator clearing operation is first performed in the above manner so as to reset all of the upper, or rotatable clutch assemblies 82 to their cleared position. Hence, all clear sensing notches 80 in the upper clutch assemblies 82 are posi tioned in a predetermined aligned relationship so as to receive the associated clear sensing lugs I31 carried by the upper slide I29. If the clearing operation were not first performed, the lugs I31 would engage the periphery of disks [9 instead of the notch 80 therein, which would block operation of control lever I25. However, when the notches 30 are in properly aligned position, the lugs enter the notches (upon rocking of control lever I25), thereby locking the upper clutch assemblies 82 against rotation. At substantially the same time as upper slide I29 is moved toward the left by rocking control arm I25 (counterclockwise in Fig. 4) to engage the lugs I31 with the coacting clear sensing notches a counter- I clockwise rocking movement is imparted to bellcrank I39, the lower arm of which depresses lower slide I33 in opposition to the resilient action of compression springs 69 on the dial shaft assemblies 92. Depression of slide I 33 disengages the lower clutch teeth 12 from the upper clutch teeth 13, as shown in Fig. 8. When each shiftable collar 1| is thus depressed, all nonrotatable components of each associated dial shaft assembly (i. e. lower clutch assembly 92, shaft 40, and dials 26), can be positioned as desired, during which time the associated upper clutch assembly 82 is restrained against angular displacement by the locking action of the coacting lug I31. In this manner, the desired angular displacement with respect to the stationary upper clutch assembly 82 is imparted to each dial shaft assembly, which displacement is proportional in magnitude to the particular value desired to be entered in that order.

After the desired fixed, or constant, value has thus been entered into a predetermined number of accumulator dials 26, the control lever I25 is then rocked clockwise and returned to the normal or inactive position shown in Fig. 4. This enables the springs 69 to re-engage the lower clutch teeth 12 on each shiftable collar ll with the upper clutch teeth 13 on the associated upper clutch assembly 82, at which time locking lug I3! is also removed from engagement with its associated notch 80. Since each dial assembly 92 has now been reclutched with its associated upper clutch and mutilated gear assembly 82 in a new position angularly displaced away from its 0 position by an angle proportional in magnitude to the fixed value desired to be entered in that accumulator order, each dial assembly 92 and its associated clutch and gear assembly 82 will now be returned to the new position during each clearing and resetting operation. Thus the accumulator dials 26 indicate the newly selected constant dividend, but overtravel of the dial assemblies 92 will be prevented by each slide finger NH and blocking tooth I8 irrespective of whether the value is 0 or some other predetermined value. In all other respects the calculating machine now functions in the usual manner, and other values can be transferred to the accumulator dials 26 and added to or subtracted from the constant dividend, or other fixed factor, in any manner desired.

The above-described constant factor entering operation is reversed in order to permanently remove a predetermined constant and preselected value from the accumulator dials 26. In such an operation the clear racks 83, 84 are first reciprocated to re-enter the predetermined constant dividend, which is now some factor other than into the accumulator dials 26 and to position all of the sensing and locking notches 89 on the upper clutch assemblies 82 to again receive for locking engagement therewith the associated lugs I31 carried by upper slide I29. Control lever I25 is then rocked (counter-clockwise as shown in Fig. 4) so as to disengage the teeth I2 carried by each shiftable collar H from the coacting teeth I3 on the associated upper clutch assembly 82, in which position of lever I25 the accumulator dial shaft assemblies are adjusted to again indicate a constant dividend of 0. This adjustment may easily be made by manually resetting the twirler knobs or by subtractively entering the constant dividend into the accumulator dials 26 by means of the keyboard selection mechanism. After all accumulator dials 26 have thus been restored to their initial position so as to again indicate 0, the control lever I25 is moved clockwise to the position shown in Fig. 4 wherein the lugs I31 are positioned free and clear of the upper clutch assemblies 82, and wherein each shiftable collar II is in clutching engagement with the associated upper clutch assembly 82, so that the latter now turns with the associated dial 26 and dial shaft assembly 92 in the usual manner. Any displacement of the plusminus slide I73 away from its neutral or inactive position, under the control of suitable means such as plus key 31 or minus key 38, imparts a rearward movement to control slide 200 (Fig. 13) so as to rock bail 295 and move interlock slide 220 forwardly (to the left as viewed in Fig. 12), whereby operation of the accumulator and revolutions counter clearing and resetting racks 83, 84, and SI is positively prevented. Moreover, this forward movement of slide 229 during digitation 1i! brings the forward portion 231 (Fig. 12) thereof into blocking engagement with ear 221 on the right end of channel I01 (see also Fig. 5) so as to lock channel Hi1 and the levers 42 carried thereby in their transfer enabling position.

I claim:

1. In a calculating machine, a register pro-. vided with a plurality of ordinally arranged dial shaft assemblies, a clutch member slidably and non-rotatably mounted on each such dial shaft assembly, a mutilated resetting gear assembly rotatably mounted on each such dial shaft assembly, a complementary clutch member on each such gear assembly, a resetting rack operable to simultaneously restore all of the said mutilated gear assemblies to a predetermined reset position, resilient means tending to urge each such slidably mounted clutch member into driving engagement with its complementary clutch member, means for simultaneously declutching all of the dial shaft assemblies from driving engagement with their respective mutilated gear assemblies, a manipulable member to control said declutching means and for selective retainment of said dial shaft assemblies in declutched position with respect to said gear assemblies, and means for adjustably turning each such dial shaft assembly while thus declutched from engagement with its associated resetting gear assembly.

2. In a calculating machine, a register provided with a plurality of ordinally arranged dial shaft assemblies each having a numeral dial keyed thereto, a clutch member slidably and nonrotatably mounted on each such dial shaft assembly, a resetting gear assembly rotatably mounted on each such dial assembly, and a complementary clutch member on each such gear assembly, a reciprocally movable rack operable to simultaneously reset all of the said gear assemblies to a predetermined adjusted position, a constant dividend entry control member, means operated by the said control member for sensing the angular position of the said resetting gear assemblies and for establishing a locking engagement with all of the said gear assemblies when they have been reset to the said predetermined adjusted position, means operated by the said control member in conjunction with the said sensing and locking means for moving each such slidably mounted clutch member to an inactive position out of engagement with its associated complementary clutch member, and means for adjustably turning each such dial shaft assembly when its associated resetting gear assembly is restrained against angular displacement by the said locking means.

3. In a calculating machine, a value selecting mechanism, a value entering mechanism, a register provided with a plurality of ordinally arranged dial shaft assemblies each having a numeral dial keyed thereto, a mutilated resetting gear assembly rotatably mounted on each such dial shaft assembly, a normally active tens-transfer mechanism for transferring a unit from a lower order register dial to a higher order register dial, a resetting rack operable to substantially simultaneously restore all of the said resetting gear assemblies to a predetermined reset position, means operated by the said resetting rack for disabling the said tens-transfer mechanism during a resetting operation, a shiftable clutch member slidably and nonrotatably mounted on each dial shaft assembly, resilient means normally urging each such shiftable clutch memher into driving engagement with its associatedv mutilated gear assembly, manually controlled means operable upon restoration of all of the said mutilated gear assemblies to the said predetermined reset position to simultaneously lock all such gear assemblies against rotation and move the associated shiftable clutches out of driving engagement therewith, means for adjustably turning each such dial shaft assembly when its associated mutilated gear assembly is thus locked against rotation, and means for automatically disabling operation of the said resetting rack and positively locking the said tens-transfer mechanism in its normally active position during the transfer of values from the said value selecting mechanism to the dial shaft assemblies in the said register.

4. In apparatus of the character described, the combination which comprises a plurality of ordinally arranged dial shaft assemblies each having a dial shaft and a numeral dial secured thereto, a normally active tens-transfer mechanism for the said dial shaft assemblies, a mutilated resetting gear provided with a clutch element and rotatably mounted on the said dial shaft, a positionable clutch element carried by each dial shaft, and resilient means normally urging each such positionable clutch element into clutching engagement with the coacting clutch element on the corresponding resetting gear, a reciprocating rack mechanism operable to engage with and reset each such mutilated gear to a predeter mined adjusted position, manually controlled means for simultaneously looking all of the said mutilated gears in the said predetermined adjusted position, the said manually controlled means being operable to substantially simultaneously move all positionable clutch elements from their normal engagement with said mutilated gear clutch elements When in their predetermined adjusted positions, means for turning the said dial shafts to predetermined ad-- justed positions for entering a predetermined constant factor into the associated numeral dials while the associated mutilated gears are thus declutched and locked against rotation, means operated by the said rack mechanism for disabling the said tens-transfer mechanism during the said resetting operation, and means operable during digitation to automatically disable the said rack mechanism and positively lock the said tens-transfer mechanism in its normally active position.

5. Apparatus of the character described for re peatedly re-entering a constant factor into the register of a calculating machine having a plurality of ordinally arranged dial shaft assemblies, including: a sieeve rotatably mounted on each such dial shaft assembly and provided with a mutilated resetting gear, a resetting rack operable to engage with the said resetting gears and restore all of the said sleeves to a predetermined reset position, a resilient clutch for each dial shaft assembly normally retained in a closed position for maintaining a driving connection with the sleeve and resetting gear associated therewith, a manually movable member for sensing the angular position of the said sleeve and locking the same against rotation after all of these sleeves have been restored to the said predetermined reset position, means controlled by the said movable member for simultaneously opening all of the said normally closed resilient clutches whenever the said sleeves are thus locked against rotation, means for differentially adlusting the angular position of the said dial as- 15 semblies with respect to the associated locked and declutched sleeves so as to enter a prede termined constant factor into and release the said factor from the said dial shaft assemblies.

6. Apparatus of the character described for repeatedly re-entering a constant dividend into the accumulator of a calculating machine provided with a tens-transfer mechanism and having a plurality of ordinally arranged dial shaft assemblies in the accumulator thereof, including: a sleeve rotatably mounted on each such dial shaft assembly, a mutilated resetting gear carried by each sleeve, a resetting rack mechanism operable to coact with the said resetting gears in such a manner as to restore all of the said sleeves to a predetermined adjusted position during a resetting operation, a normally closed resilient clutch for connecting each such sleeve and resetting gear with its associated dial shaft assembly, a manually movable member sensing the angular position of the said sleeves and locking the same in a stationary position after all such sleeves have been restored to the said predetermined adjusted position by the said resetting mechanism, means controlled by the said movable member for simultaneously opening all of the said normally closed resilient clutches, means for differentially adjusting the angular position of the said dial shaft assemblies with respect to their associated stationary sleeves so as to enter a predetermined constant dividend into and erase the said constant dividend from the said accumulator dials, means for disabling the said resetting rack during digitation, means operated by the said resetting for disabling the said tens-transfer mechanism during a resetting operation, and means for positively holding the said tens-transfer mechanism in its active position during digitation.

In a calculating machine, an accumulator, a plurality of ordinally arranged dial shaft assemblies in the said accumulator, a positionable clutch element carried by each such dial shaft assembly, a mutilated gear assembly provided with a complementary clutch element rotatably mounted on the said dial shaft assembly, resilient means for normally holding each such positionable clutch element in clutching engagement with the coacting clutch element on the corresponding gear assembly, mechanism for restoring the said gear assemblies to a predetermined reset position, a control member settable to an adjusted position when the said gear assemblies are in said predetermined position, mechanism controlled by movement of the said settable member to its adjusted position for looking all of the said gear assemblies against rotation and concurrently displacing said positionable clutch elements, and means for adjustably turning the said dial shaft assemblies while said positionable clutch elements are -dis placed from their engagement with their associated complementary clutch elements on the resetting gear assemblies.

8. In a calculating machine, an accumulator, a plurality of ordinaily arranged dial shaft assemblies in the said accumulator, a mutilated resetting assembly rotatably mounted on each such dial shaft assembly, a normally closed clutch in each order for connecting said resetting gear assembly with its associated dial shaft assembly, resetting mechanism including a rack for restoring all of the said gear assemblies to a predetermined reset position, a settable control member, mechanism operated by the said for settable member for opening all of the said ordinal clutches and concurrently locking all of the said gear assemblies against rotation when in the said predetermined reset position, means for adjustably turning each such dial shaft assembly unrestrainedly when its associated gear assembly is thus locked against rotation, a tens-transfer mechanism for the said accumulator normally biased to its transfer enabling position, mechanism operated by the said rack for disabling the said tens-transfer mechanism during a resetting operation, and mechanism effective during digitation to positively lock the said tens-transfer mechanism in its transfer enabling position.

9. In a calculating machine, a register provided with a plurality of dial assemblies, tens-transfer mechanisms associated with said dial assemblies, a resetting assembly rotatably mounted on each such dial assembly, a retractable coupling on each such dial assembly for connecting said dial assemblies with said resetting assemblies, a resetting actuator operable to substantially simultaneously restore all of the said resetting assemblies to a predetermined angular position, retraction means for said couplings to selectively engage and disengage the said resetting assemblies With their respective dial assemblies including a single member positionable to operate all of said couplings substantially simultaneously, a tens-transfer disabling means operated by the resetting actuator to disable the tens-transfer mechanisms, and means for adjustably turning each such dial assembly while disengaged from its associated resetting gear assembly.

10. In combination with a register of a calculating machine having a plurality of ordinally arranged dial assemblies, an ordinal resetting device rotatably mounted on each such dial assembly, a resetting means operable to restore all of the said resetting devices to a predetermined position, and a clutch member associated with each dial assembly and normally engaging the respective resetting devices, the improvement which comprises a manually movable member operable only when said resetting devices are in the predetermined position for locking the same against rotation, means controlled by the said movable member for simultaneously disengaging all of the said clutch members, and means for differentially adjusting the angular position of the said dial assemblies with respect to the associated locked and declutched resetting devices.

11. In combination with an accumulator of a calculating machine having a plurality of ordinally arranged dial assemblies, ordinal tenstransfer mechanisms associated with said dial assemblies, an ordinal resetting device rotatably mounted on each such dial assembly, a resetting mechanism operable to restore all of the said resetting devices to a predetermined position, and a normally engaged clutch member for connecting each such resetting device with its associated dial assembly, the improvement which comprises a manually movable member operable only when said resetting devices are in a predetermined position for locking the same against rotation, means controlled by the said movable member for simultaneously disengaging all of the said clutch members, means for differentially adjusting the angular position of the said dial assemblies with respect to their associated resetting devices, means operated by the said resetting mechanism for disabling the said tens-transfer mechanism during a resetting operation, and means for positively holding the said tens-transfer mechanism in its active position during digitation.

12. In a calculating machine, a register provided with a plurality of dial shaft assemblies each including a dial shaft, a clutch element nonrotatably mounted on each such dial shaft, a mutilated resetting gear assembly rotatably mounted on each such dial shaft, and a complementary clutch element on each such gear assembly normally engaged with said clutch element, a resetting rack operable to substantially simultaneously restore all of the said mutilated gear assemblies to a predetermined angular position, means for simultaneously locking all of the said mutilated gear assemblies against rotation in either direction while the same are in the said predetermined angular position, means for selectively declutching all of the said resetting gear assemblies from their associated shafts, a manually positionable member for control of said locking means and said declutching means, and means for adjustably turning each such dial shaft without restraint while declutched from its associated gear assembly.

13. In a calculating machine, a register provided with a plurality of ordinally arranged dial shaft assemblies each having a numeral dial thereon, a clutch member slidably and nonrotatably mounted on each such dial shaft assembly, a resetting gear member journalled on each such dial shaft assembly, and a complementary clutch member on each such gear member, a resetting rack operable to simultaneously restore all of the said resetting gear members to substantially the same predetermined angular position, resilient means normally urging each of the said slidably mounted clutch members into driving engagement with its associated complementary clutch member, manually controlled means operable whenever all of the said resetting gear members have been restored to the said predetermined angular position to lock each such resetting member against rotation and move the associated slidably mounted. clutch member out of driving engagement with its complementary clutch member, and means for adjustably turning each such dial shaft assembly and numeral dial while the associated resetting gear member is thus locked against rotation.

14. In apparatus of the character described, the combination which comprises a plurality of ordinally arranged dial shaft assemblies each having a dial shaft and a numeral dial secured thereto, a mutilated resetting gear provided with a clutch element and rotatably mounted on the said dial shaft, a positionable clutch element carried by each dial shaft, and resilient means normally urging each such positionable clutch element into clutching engagement with the coacting clutch element on the corresponding resetting gear, a reciprocating rack mechanism operable to reset each such mutilated gear to a predetermined angular position, a manually movable member selectively operable to simultaneously look all of the said mutilated gears against rotation when in their reset position, mechanism operated by the said movable member for simultaneously disengaging said positionable clutch elements from their associated mutilated gear clutch elements, and means for turning the said dial shafts to predetermined adjusted positions for entering a predetermined constant factor into the said numeral dials while the associated mutilated gears are thus locked against rotation and disengaged from the positionable clutch elements.

HAROLD J. CHALL.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,805,061 Walter May 12, 1931 1,995,434 Overbury Mar. 26, 1935 2,310,281 Friden Feb. 9, 1943 2,360,704 Moody Oct. 17, 1944 

